It's a Sears bike, note the '502' code, and the catalog #, which looks like 46201 to me, is a 1965 basic cruiser. A junior brother to the Flightliner. -Adam
Cantilever bars go into the down tube like a Murray Missile.
I used the numbers 50246201 at Sears Parts Direct, they have a few replacement parts and yours looks like it's all there except for the fork I don't know but a real Cool find. http://www.searspartsdirect.com/partsdi ... t=&shdMod=